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Jurassic Forum » JURASSIC references & paper reviews » Jurassic around the world » Price et al. (2009) (Isotopic analysis of Jurassic fish otoliths & molluscs)
Price et al. (2009)
mhornДата: Sunday, 17.05.2009, 22:26 | Сообщение # 1
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Price, G.D., Wilkinson, D., Hart, M.B., Page, K.N. & Grimes, S.T. (2009) Isotopic analysis of coexisting Late Jurassic fish otoliths and molluscs: Implications for upper-ocean water temperature estimates // Geology. V.37. P.215–218.

pdf: http://www.research.plymouth.ac.uk/paleopa....09b.pdf

The O isotope compositions of well-preserved Jurassic fish otoliths from Wootton Bassett, UK, provide upper-ocean paleotemperatures that are comparable with those derived from the isotopic analysis of lish tooth phosphates, providing independent scrutiny of such paleotemperatures. O-isotope otolith temperatures in excess of 30 "C also rival temperatures associated with the middle Cretaceous thermal maximum. The negative carbon isotopes of the otoliths may point to a freshwater influence and potentially migratory nature of the fish. However, given the large departures from equilibrium fractionation toward more negative carbon values reported from modern marine fish, authors consider temperature interpretations to be robust and representative of the marine depositional environment. Depleted C isotope values, perhas, suggest that the otoliths examined in this study belong to fish with high metabolic rates.


Middle Jurassic - Lower Cretaceous ammonites & aptychi
 
mhornДата: Wednesday, 20.05.2009, 11:06 | Сообщение # 2
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additional data, including information concerning stable isotopes in all studied specimens, available online through ftp://rock.geosociety.org/pub/reposit/2009/2009058.pdf

Middle Jurassic - Lower Cretaceous ammonites & aptychi
 
Jurassic Forum » JURASSIC references & paper reviews » Jurassic around the world » Price et al. (2009) (Isotopic analysis of Jurassic fish otoliths & molluscs)
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